Clean Water Act discharge permit · NPDES MTR108049

ROCKY MOUNTAIN RANCH, Big Sky, MT: NPDES MTR108049 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

ROCKY MOUNTAIN RANCH, held by ON SITE MANAGEMENT, INC., holds NPDES permit MTR108049, which discharges to First Yellow Mule Creek. EPA’s file records it issued September 9, 2019 and expiring December 31, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for ROCKY MOUNTAIN RANCH: its NPDES ID, its permit type and status, its dates, its address in Big Sky, Montana, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTR108049.

Identity

Facility as filed	ROCKY MOUNTAIN RANCH
Permittee as filed	ON SITE MANAGEMENT, INC.
NPDES ID	MTR108049
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Construction stormwater
Issued	September 9, 2019
Expiration date	December 31, 2022
Address	Big Sky, MT 59716
Receiving water	FIRST YELLOW MULE CREEK
Subwatershed	South Fork West Fork Gallatin River (HUC 100200080201)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES MTR108049.

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MTR108049.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MTR108049 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers NPDES permit MTR108049, held by ON SITE MANAGEMENT, INC. for ROCKY MOUNTAIN RANCH in Big Sky, MT, which discharges to FIRST YELLOW MULE CREEK in the South Fork W subwatershed. The page lists a permit status of Effective, a discharger class of Minor discharger, and 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance. EPA's file records the permit as issued September 9, 2019 and expiring December 31, 2022.